+function ($) {
  'use strict';

  // TAB CLASS DEFINITION
  // ====================

  var Tab = function (element) {
    this.element = $(element);
  };

  Tab.VERSION = '1.0.0';
  Tab.TRANSITION_DURATION = 150;

  Tab.prototype.constructor = Tab;

  Tab.prototype.show = function () {
    var $this = this.element;
    var $ul = $this.closest('ul:not(.dropmenu)');
    var selector = $this.data('target');

    if (!selector) {
      selector = $this.attr('href');
      selector = selector && selector.replace(/.*(?=#[^\s]*$)/, '');
    }

    if ($this.parent('li').hasClass('active')) return;

    var $previous = $ul.find('.active:last a');
    var hideEvent = $.Event('hide.bs.tab', {
      relatedTarget: $this[0]
    });
    var showEvent = $.Event('show.bs.tab', {
      relatedTarget: $previous[0]
    });

    $previous.trigger(hideEvent);
    $this.trigger(showEvent);

    if (showEvent.isDefaultPrevented() || hideEvent.isDefaultPrevented()) return;

    var $target = $(selector);

    this.activate($this.closest('li'), $ul);
    this.activate($target, $target.parent(), function () {
      $previous.trigger({
        type: 'hidden.bs.tab',
        relatedTarget: $this[0]
      });
      $this.trigger({
        type: 'shown.bs.tab',
        relatedTarget: $previous[0]
      });
    });
  };

  Tab.prototype.activate = function (element, container, callback) {
    var $active = container.find('> .active');
    var transition = callback &&
      $.support.transition &&
      ($active.length && $active.hasClass('fade') || !!container.find('> .fade').length);

    function next() {
      $active.removeClass('active')
        .find('> .dropmenu > .active')
        .removeClass('active')
        .end()
        .find('[data-toggle="tab"]')
        .attr('aria-expanded', false);

      element.addClass('active')
        .find('[data-toggle="tab"]')
        .attr('aria-expanded', true);

      if (transition) {
        element[0].offsetWidth;
        element.addClass('in');
      } else {
        element.removeClass('fade');
      }

      if (element.parent('.dropmenu').length) {
        element
          .closest('li.dropdown')
          .addClass('active')
          .end()
          .find('[data-toggle="tab"]')
          .attr('aria-expanded', true);
      }

      callback && callback();
    }

    $active.length && transition ?
      $active.one('bsTransitionEnd', next)
        .emulateTransitionEnd(Tab.TRANSITION_DURATION) :
        next();

    $active.removeClass('in');
  };

  // TAB PLUGIN DEFINITION
  // =====================

  function Plugin(option) {
    return this.each(function () {
      var $this = $(this);
      var data  = $this.data('bs.tab');

      if (!data) $this.data('bs.tab', (data = new Tab(this)));
      if (typeof option === 'string') data[option]();
    });
  }

  var old = $.fn.tab;

  $.fn.tab = Plugin;
  $.fn.tab.Constructor = Tab;

  // TAB NO CONFLICT
  // ===============

  $.fn.tab.noConflict = function () {
    $.fn.tab = old;
    return this;
  };

  // TAB DATA-API
  // ============

  var clickHandler = function (e) {
    e.preventDefault();
    Plugin.call($(this), 'show');
  };

  $(document)
    .on('click.bs.tab.data-api', '[data-toggle="tab"]', clickHandler)
    .on('click.bs.tab.data-api', '[data-toggle="pill"]', clickHandler);

}(jQuery);